﻿/*
 * Copyright 2019 Amazon.com, Inc. or its affiliates. All Rights Reserved.
 *
 * Licensed under the Apache License, Version 2.0 (the "License").
 * You may not use this file except in compliance with the License.
 * A copy of the License is located at
 *
 *  http://aws.amazon.com/apache2.0
 *
 * or in the "license" file accompanying this file. This file is distributed
 * on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either
 * express or implied. See the License for the specific language governing
 * permissions and limitations under the License.
 */
using System;
using Amazon.Lambda.RuntimeSupport.Helpers;
using System.Diagnostics;

namespace Amazon.Lambda.RuntimeSupport
{
    internal class StackFrameInfo
    {
        public StackFrameInfo(string path, int line, string label)
        {
            Path = path;
            Line = line;
            Label = label;
        }

#if NET8_0_OR_GREATER
        [System.Diagnostics.CodeAnalysis.UnconditionalSuppressMessage("ReflectionAnalysis", "IL2026",
            Justification = "Constructor has defensive code in place in case the method for the stack frame has been trimmed.")]
#endif
        public StackFrameInfo(StackFrame stackFrame)
        {
            Path = stackFrame.GetFileName();
            Line = stackFrame.GetFileLineNumber();

            try
            {
                var method = stackFrame.GetMethod();
                if (method != null)
                {
                    var methodTypeName = method?.DeclaringType?.Name;
                    if (methodTypeName == null)
                    {
                        Label = method.Name;
                    }
                    else
                    {
                        Label = methodTypeName + "." + method.Name;
                    }
                }
            }
            catch(Exception ex)
            {
                InternalLogger.GetDefaultLogger().LogError(ex, "Failed to compute Label for stack frame method");
            }

            if(Label == null)
            {
                Label = "Method has been trimmed";
            }
        }

        public string Path { get; }
        public int Line { get; }
        public string Label { get; }
    }
}
